BlackBook is a really cool app that lets you hide information on your BlackBerry from prying eyes. Sure, you can always put a password on your device, but that makes it obvious that you might have something to hide. What’s more innocent about someone with an unlocked device and everything there for you to see? The app doesn’t even have an icon and launches only with a secret key input.

New to BlackBook:

ENHANCED SMS FILTERING: To hide SMS, there’s no more Setup Guide to follow. No firewall settings to change. No complications. BlackBook now instantly hides SMS’ from newly added, and imported contacts!